A method for combined sealing of near-horizontal gas drainage drilling cuttings and pockets
A technology of gas drainage and bagging, which is applied in earthwork drilling, sealing/sealing, wellbore/well components, etc. It can solve problems such as high operation requirements, complicated operation, and difficulty in foaming, and simplify the grouting process , Simple operation, anti-seepage effect
Inactive Publication Date: 2017-09-29
CHINA UNIV OF MINING & TECH
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Problems solved by technology
Among them, mechanical cementing mortar sealing is suitable for inclined drilling; double-stage grouting sealing is suitable for near-horizontal or gently inclined coal seams, but the operation is extremely complicated; foaming polymer material sealing has high foaming ratio, light weight, and easy sealing. The advantages of rapidity, but its high cost, low strength after molding, easy to catch fire, difficult to foam when exposed to water, high operating requirements and other disadvantages
The sealing speed of the hole sealer is fast and repeated use can reduce the cost, but the effect is poor, and it is only suitable for temporary extraction and sealing
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[0021] An embodiment of the present invention will be further described below in conjunction with accompanying drawing:
[0022] Such as figure 1 As shown, the method for combining drilling cuttings and bladder bags for near-horizontal gas drainage of the present invention includes the use of large drill bits of Φ113mm, small drill bits of Φ75mm, drill pipes of Φ42mm, PVC sleeves, flower tubes, bladder bags, The plugging materials used for grouting pipes and pressure gauges are high-water materials and drilling cuttings. In order to ensure the smooth construction of near-horizontal gas drainage drilling and the accurate fall of cuttings into the predetermined position, the preliminary preparations are made:
[0023] (1) Use a geological compass to determine the azimuth and inclination of the drilling rig;
[0024] (2) Directly use the downhole air pipe for air supply and powder discharge;
[0025] (3) Connect the drill pipe and the drill bit, and start the drilling rig for ...
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The invention relates to a hole sealing method for near-horizontal gas drainage drilling cuttings combined with a bag, which is suitable for near-horizontal drilling. Construct a large borehole on the coal body, insert a PVC sleeve with a flower tube at the front end, and insert the PVC sleeve with a fixed bladder into the large borehole after withdrawing the drill. Inject the high-water material into the bladder bag through the grouting pipe bound with the bladder bag, and the inner end of the grouting tube is bound together with the PVC casing with iron wire. After the high-water material is solidified, use the small drill bit to continue construction along the large borehole for a certain distance. During the drilling process, the drill chips discharged by the pneumatic drill will fall into the gap between the PVC casing and the wall of the large borehole due to the action of the wind, and will be automatically filled. The gap between the PVC casing and the large drill hole is solidified, and the integration of drilling and sealing is realized. The pouch plays the role of a hole sealer and can well prevent the seepage of high-water materials. The pouch and the drill cuttings discharged during the drilling process can be used to complete the sealing, which reduces the cost of sealing the hole and improves the sealing efficiency. efficiency. The operation is simple and the sealing effect is good.
Description
technical field [0001] The invention relates to a hole sealing method, in particular to a hole sealing method which is suitable for a near-horizontal gas drainage underground drilling cuttings and a bag in a coal mine. Background technique [0002] The key to gas drainage is to adopt suitable sealing technology and material, and the quality of sealing holes directly affects the efficiency of gas drainage. At present, the sealing technologies used at home and abroad mainly include mechanical cement mortar sealing, two-stage grouting sealing, foaming polymer material sealing, and hole sealing device sealing. Among them, mechanical cementing mortar sealing is suitable for inclined drilling; double-stage grouting sealing is suitable for near-horizontal or gently inclined coal seams, but the operation is extremely complicated; foaming polymer material sealing has high foaming ratio, light weight, and easy sealing. The advantages of rapidity, but its high cost, low strength after...
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IPC IPC(8): E21B33/13
Inventor 郝志勇宋吴兵苏云龙孙炜浩李博洋
Owner CHINA UNIV OF MINING & TECH